EP0196676B1 - Verfahren und Vorrichtung für die Schussfadeneintragkontrolle - Google Patents

Verfahren und Vorrichtung für die Schussfadeneintragkontrolle Download PDF

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Publication number
EP0196676B1
EP0196676B1 EP86104648A EP86104648A EP0196676B1 EP 0196676 B1 EP0196676 B1 EP 0196676B1 EP 86104648 A EP86104648 A EP 86104648A EP 86104648 A EP86104648 A EP 86104648A EP 0196676 B1 EP0196676 B1 EP 0196676B1
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European Patent Office
Prior art keywords
weft
angle
detaining
measuring
signal
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Expired - Lifetime
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EP86104648A
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English (en)
French (fr)
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EP0196676A3 (en
EP0196676A2 (de
Inventor
Katsuhiro Sugita
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Tsudakoma Corp
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Tsudakoma Corp
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Publication of EP0196676A3 publication Critical patent/EP0196676A3/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
    • B65H2557/33—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for digital control, e.g. for generating, counting or comparing pulses

Definitions

  • the present invention relates to a weft insertion control method for keeping constant the length of the weft picked in each pick by controlling the operation of a weft inserting device which measures and reserves a weft by winding the weft on a stationary measuring and reserving drum by means of a rotary yarn guide, releases the weft from and detains the same on the measuring and reserving drum by reciprocating a detaining pin relative to the measuring and reserving drum, detects the number of winds of the weft removed from the measuring and reserving drum, and picks the weft wound and reserved on the measuring and reserving drum using a picking nozzle.
  • a rotary yarn guide draws out a weft from a yarn package and winds the weft around the outer circumference of a stationary measuring and reserving drum to measure and reserve the weft having a length sufficient for one weft insertion cycle, and a weft detaining pin is moved toward and away from the drum to detain the weft on the outer circumference of the drum and to release the weft wound on the drum for weft insertion, respectively.
  • a picking nozzle spouts a pressurized fluid along the shuttle path into the shed to insert the weft having a meassured lenght into the shed.
  • Rotative driving means for driving the rotary yarn guide and reciprocative driving means for advancing and retracting the detaining pin are interlocked mechanically with the crankshaft of the loom in order to operate the rotary yarn guide and the detaining pin synchronously with the principal motion of the loom.
  • the detaining pins need to cease from motion sequentially at regular or irregular intervals according to the sequence of insertion of the different wefts, which requires intermittent disconnection of the detaining pins from the cyclic principal motion of the loom.
  • the mechanical interlocking means is unable to disconnect the detaining pins intermittently or at irregular intervals, so that optional weft insertion is impossible.
  • the reciprocating speed of the mechanically controlled detaining pin is limited, the reciprocation of the detaining pin becomes unstable when the loom is operated at a high speed.
  • Such a problem can be solved by driving the rotary yarn guide by an individual motor and by driving the detaining pin by an individual driving device, such as an electromagnetic device, instead of driving the rotary yarn guide and the detaining pin by the crankshaft of the loom through a mechanical interlocking mechanism.
  • an individual driving device such as an electromagnetic device
  • the weft inserting speed varies due to the variation of the related factors, such as the tension of the weft in winding the same on the measuring drum. Therefore, the length of the inserted wefts varies when the timing of reciprocation of the detaining pin is fixed.
  • a weft clamp controller to prevent the insertion of wefts having an excessive or deficient length is disclosed in Unexamined Japanese Patent Publication No. 57-29640.
  • This weft clamp controller controls a weft clamp on the basis of the actual length of the weft unwound from the measuring drum detected by an optical sensor provided on the measuring drum.
  • This invention is very effective only if the optical sensor functions correctly. However, the weft passes the optical sensor in a very short time and the optical sensor is liable to malfunction when waste flies across the optical sensor or when intensive external light enters the optical saensor. Consequently, incomplete or unstable weft insertion results.
  • EP-A-0 112 555 a control arrangement for weaving loom or the like is disclosed.
  • the apparatus described there also uses light emitting sensors for controlling the yarn loops leaving a drum.
  • the number of winds of the weft unwound from the measuring drum is detected by an optical sensor, the timing of unwinding the last wind of the weft and a predetermined reference detaining timing are compared, and then the reference detaining timing is corrected on the basis of the time difference between the timing of unwinding the last wind of the weft and the predetermined reference detaining timing.
  • the detaining timing of the detaining pin is corrected automatically according to the actual weft inserting speed. Consequently, stable weft measuring and reserving operation is achieved and the insertion of the weft having incorrect length is prevented.
  • a control unit regulates the detaining timing of the detaining pin at an appropriate timing for every cycle or for every several cycles of operation of the loom.
  • an optical sensor employed in the present invention is the same as the optical sensor employed in the above-mentioned prior invention in the probability of malfunction.
  • the control unit does not execute a series of corrective procedures when the number of pulses of the detection signal is greater or smaller than a predetermined number, the frequency of malfunction of the optical sensor is reduced to the least extent. Since the false signal provided by the optical sensor through malfunction is ignored as invalid, the malfunction of the control system is prevented surely to achieve stable control functions.
  • the detaining timing of the detaining pin is corrected according to the actual weft inserting condition to establish an appropriate detaining timing.
  • weft inserting speed control means adjusts the weft inserting speed, and thereby the weft inserting motion is adjusted so as to match the principal motion of the loom, namely, the shedding motion and beating motion, for stable weft insertion.
  • the excessive adjustment of the weft inserting speed will affect adversely to the principal motion of the loom. Accordingly, the range of adjustment of the weft inserting motion is predetermined so that the principal motion of the loom is carried out normally.
  • Fig. 1 illustrates the constitution of a weft insertion control device 1 according to the present invention and the consitution of a weft inserting device 100 to be controlled by the weft insertion control device 1.
  • the weft inserting device 100 comprises, as the principal mechanical components, a rotary yarn guide 2, a measuring and reserving drum 3, a detaining pin 4, a picking nozzle 5, an individual motor 8 and a solenoid 9.
  • the rotary yarn guide 2 is driven by the individual motor 8 to draw out a weft 7 from a yarn package 6 and to wind the weft 7 on the stationary measuring and reserving drum 3.
  • the detaining pin is driven by the solenoid 9 so as to engage the circumference of the drum 3 to detain the weft 7 when the weft 7 is being measured and wound on the drum 3.
  • the detaining pin 4 is retracted to be separated from the drum 3.
  • the weft insertion control device 1 is equipped with an electronic control system comprising a first comparator 10, an encoder 11 for detecting the phase of the loom, namely, the angular position of the crankshaft of the loom, an adjustable timing device 12, a driver 13 for driving the solenoid 9, a picking speed controller 14, an alarm device 15, an optical sensor 16 having a light emitting element and a photoelectric element, a preset counter 17, a second comparator 18, a memory 19, a read decision circuit 20, a correcting circuit 21 and an auxiliary preset counter 22.
  • One of the input terminals of the first comparator 10 is connected to the encoder 11, while the other input terminal of the same is connected to the timing device 12.
  • the optical sensor 16 is disposed opposite to the drum 3 on the side of the picking nozzle 5 with respect to the detaining pin 4, and functions as the detecting head of a feedback correction system.
  • the output terminal of the optical sensor 16 is connected through the preset counter 17, the second comparator 18, the memory 19, the read decision circuit 20 and the correcting circuit 21 to the input terminal of the timing device 12 and also through the auxiliary preset counter 22 to the reset signal input terminal of the memory 19.
  • the rotary yarn guide 2 is rotated at a fixed speed to draw out the weft 7 from the yarn package 6 and winds the weft 7 on the drum 3.
  • the detaining pin 4 is brought into abutment with the circumference of the drum 3 to detain the weft 7 on the drum 3.
  • the weft 7 having a length somewhat greater than a length necessary for one picking operation is measured and reserved on the drum 3.
  • the encoder 11 detects the phase angle ⁇ of the loom and gives a signal corresponding to the phase angle ⁇ to the comparator 10 once every turn of the crankshaft of the loom.
  • the timing device 12 gives a detaining pin retracting phase signal corresponding to a weft releasing angle ⁇ 1 and a detaining pin advancing phase signal corresponding to a weft detaining angle ⁇ 2 to the first comparator 10.
  • the first comparator 10 compares the weft releasing phase signal and the weft detaining phase signal and gives a drive signal S1 of H-level to the driver 13 during a period from the weft releasing angle ⁇ 1 to the weft detaining angle ⁇ 2 to make the driver 13 drive the solenoid 9 so as to retract the detaining pin 4 during the duration of the driving signal S1 of H-level. Then, the weft 7 reserved on the drum 3 is unwound from the drum 3 and is picked into a shed together with a picking fluid by the picking nozzle 5.
  • the optical sensor 16 While the weft is being inserted into the shed, the optical sensor 16 generates a detection signal S2 having pulses corresponding to the number of winds of the weft 7 unwound from the drum 3. Suppose that the number of winds of the weft 7 required for one cycle of the picking operation is three, the detection signal S2 has three pulses for normal picking operation.
  • the preset counters 17 and 22 and the memory 19 are initialized in a state "O" by a reset signal S3.
  • the preset counter 17 counts the pulses of the detection signal S2 during the weft picking operation and gives a comparison command signal S4 to the second comparator 18 upon the count of the third pulse, namely, at a moment when the last wind of the weft 7 on the drum 3 is unwound.
  • the second comparator 18 compares the weft detaining angle ⁇ 2 and the phase of the comparison command signal S4 once every cycle of the weaving motion of the loom, and then generates a correction angle signal ⁇ corresponding to the time difference between the weft detaining angle ⁇ 2 and the phase of the comparison command signal S4.
  • the correction angle signal ⁇ is stored in the memory 19.
  • a read signal S5 is given to the read decision circuit 20.
  • the read decisioncircuit 20 reads the correctionangle signal ⁇ from the memory 19 and gives the same to the correcting circuit 21.
  • the correcting cirtcuit 21 averages the correction angle signal ⁇ once every fixed cycles of the weaving operation of the loom, and then generates a digital or analog correction signal S6 on the basis of the average value of the correction angle signals ⁇ , to correct the weft detaining angle ⁇ 2 of the timing device 12 so that the time difference of the weft detaining angle ⁇ 2 from the phase of the comparison command signal S4 is reduced to zero, to advance or delay the weft detaining phase.
  • the correcting circuit 21 averages the correction angles to avoid the sudden change of the control mode, however, this averaging procedure may be omitted when the correction is required for every cycle of the weaving operation.
  • the weft detaining phase is advanced relative to an appropriate phase by an expected delay time in expectation of the delayed action of those components.
  • the reference weft detaining angle set at the start of the weaving operation is corrected momentarily as the weaving operation continues and, thereafter, the corrected weft detaining angle is renewed according to the variation of the weaving condition.
  • the weft releasing angle ⁇ 1 is decided previously so that the picking operation is effected when an optimum shed is formed, and hence the weft releasing angle ⁇ 1 need not be corrected.
  • the timing device 12 gives respectively corresponding to angles within a phase range angle ⁇ 3 defining the range of correction of the weft detaining angle and a phase range angle ⁇ 4 defining the alarm range in the range of correction of the weft detaining angle, to the first comparator 10.
  • the weft detaining angle ⁇ 2 is regulated automatically within the phase range angle ⁇ 3 defining the range of correction.
  • the first comparator 10 gives a signal S0 corresponding to the present weft detaining angle to the alarm device 15 and to the picking speed controller 14.
  • the alarm device 15 gives a sound or light alarm to inform the operator of the abnormal weaving condition, while the picking speed controller 14 corrects the picking speed to a predetermined value, for example, by enhancing or reducing the pressure of the pressurized picking fluid to be supplied to the picking nozzle 5.
  • a cycle A corresponds to the operation for advancing the weft detaining angle ⁇ 2
  • a cycle B corresponds to the operation for delaying the weft detaining angle ⁇ 2.
  • the weft insetrtion control device 1 operates in the manner as described hereinbefore when the optical sensor 16 provides a normal detection signal, namely, a signal having three pulses in this embodiment.
  • the weft insertion control device 1 operates in the following manner when the optical sensor 16 provides a detection signal having pulses other than three pulses, namely, two or less pulses or four or more pulses.
  • the present counter 17 does not provide the comparison command signal S4. Consequently, the second comparator 18 does not operate during this picking cycle, and hence the correction angle signal ⁇ is not given to the memory 19. In this case, the above-mentioned weft detaining angle correcting operation is not executed. Thereafter, the preset counters 17 and 22 and the memory 19 are initialized by the reset signal S3 for the weft detaining angle correcting operation in the next picking cycle.
  • the optical sensor 16 has provided a detection signal having four pulses.
  • the preset counter 17 gives the comparison command signal S4 to the second comparator 18 at a wrong time. Consequently, the memory 19 stores the wrong information.
  • the auxiliary preset counter 22 gives an auxiliary reset signal S7 to the memory 19 upon the reception of the detection signal S2 having four pulses from the optical sensor 16, and thereby the contents of the memory 19 is erased. Accordingly, the read decision circuit 20 is unable to read any signal from the memory 19, and thereby erroneous control operation is surely avoided.
  • the same control procedures are carried out also when the optical sensor 16 provides a detection signal having more than four pulses.
  • the memory 19 is reset twice or more, which does not matter to the weft insertion control operation. Such a case is shown by cyle C in Fig. 2.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (5)

  1. Schußfadeneintragskontrollverfahren zum Konstanthalten der Länge des Schußfadens (7), der bei jedem Schuß eingetragen wird, durch Überwachen des Betriebes einer Schußfadeneintragsvorrichtung (100), welche einen Schußfaden (7) mißt und in Reserve hält, indem der Schußfaden (7) auf eine stationäre Meß- und Halte-Trommel (3) mit Hilfe einer drehbaren Garnführung (2) gewickelt wird, den Schußfaden (7) davon freisetzt und denselben auf der Meß- und Halte-Trommel (3) zurückhält, indem ein Rückhaltestift (4) relativ zu der Meß- und Halte-Trommel (3) hin- und herbewegt wird, die Anzahl der Windungen des Schußfadens (7) erfaßt, die von der Meß- und Halte-Trommel (3) entfernt worden sind, und den auf der Meß- und Halte-Trommel (3) aufgewickelten und in Reserve gehaltenen Schußfaden (3) unter Verwendung einer Eintragdüse (5) aufnimmt, gekennzeichnet durch die Schritte:
    (a) Überwachen eines Rückhaltestiftes (4), einschließlich der Schritte:
       Vergleichen eines vorliegenden SchußfadenFreigabewinkels (ϑ₁) und eines Referenz-Schußfaden-Rückhaltewinkels (ϑ₂) mit dem Phasenwinkel (ϑ) der Webmaschine,
       Zurückziehen des Rückhaltestiftes (4), wenn der Phasenwinkel (ϑ) des Webstuhls am SchußfadenFreigabewinkel (ϑ₁) ist, um den Rückhaltestift (4) vom Außenumfang der Meß- und Halte-Trommel (3) zu trennen, und
       Vortreiben des Rückhaltestiftes (4), wenn der Phasenwinkel (ϑ) des Webstuhls am Referenz-Schußfaden-Rückhaltewinkel (ϑ₂) ist, um den Rückhaltestift (4) in Anschlag mit dem Außenumfang der Meß- und Halte-Trommel zu bringen;
    (b) Vergleichen des Phasenwinkels, bei dem die letzte Windung des Schußfadens (7) von der Meß- und Haltetrommel (3) abgewickelt ist, mit dem Referenz-Schußfaden-Rückhaltewinkel (ϑ₂), um die Winkeldifferenz (Δ ϑ) zwischen ihnen zu erhalten; und
    (c) Korrigieren des Referenz-Schußfaden-Rückhaltewinkels (ϑ₂) auf der Grundlage der Winkeldifferenz (Δϑ), die in dem Vergleichsschritt erhalten worden ist, so daß die Winkeldifferenz (Δϑ) auf 0 reduziert wird.
  2. Schußfadeneintragskontrollverfahren nach Anspruch 1, einschließlich der Schritte
       Bestimmen, ob der korrigierte Referenz-Schußfaden-Rückhaltewinkel (ϑ₂) innerhalb eines vorbestimmten Winkelbereiches liegt, und
       Überwachen der Eintraggeschwindigkeit, wenn der korrigierte Referenz-Schußfaden-Rückhaltewinkel außerhalb des vorbestimmten Bereiches liegt, um die Länge des Schußfadens (7), die bei jedem Schuß aufgenommen wird, zu steuern und konstant zu halten.
  3. Schußfadeneintragskontrollvorrichtung zum Durchführen des Verfahrens nach Anspruch 1 oder 2, mit:
       einer einstellbaren Taktvorrichtung (12) zum Einstellen eines Schußfaden-Freigabewinkels (ϑ₁) und eines Referenz-Schußfaden-Rückhaltewinkels (ϑ₂);
    Phasenwinkelerfassungsmittel zum Erfassen des Phasenwinkels (ϑ) der Webmaschine;
    einem ersten Komparator (10), welcher Signale empfängt, die jeweils dem Schußfaden-Freigabewinkel (ϑ₁) und dem Referenz-Schußfaden-Rückhaltewinkel (ϑ₂) von der Taktvorrichtung (12) entsprechen, und diese Signale mit dem Phasenwinkel der Webmaschine (ϑ) von dem Phasenwinkelerfassungsmittel vergleicht und dann ein Treibersignal zum Treiben des Rückhaltestiftes (4) zur Verfügung stellt;
    einem Detektor (16), der die Anzahl der Windungen des Schußfadens (7) erfaßt, die von der Meß- und Halte-Trommel (3) entfernt worden sind, und eine entsprechende Pulszahl erzeugt;
    einem Vorwahlzähler (22), welcher die Anzahl der Pulse von dem Detektor (16) zählt und ein Vergleichssteuersignal nach dem Zählen der letzten Windung einer vorbestimmten und voreingestellten Anzahl von Windungen zur Verfügung stellt;
    einem zweiten Komparator (18), der das Vergleichssteuersignal vom Vorwahlzähler (22) und den Referenz-Schußfaden-Rückhaltewinkel (ϑ₂) vergleicht und ein korrigierendes Winkelsignal entsprechend der Winkeldifferenz zwischen dem Vergleichssteuersignal und dem Referenz-Schußfaden-Rückhaltewinkel (ϑ₂) zur Verfügung stellt;
    einem Speicher (19), welcher das Korrektur-Winkelsignal vom zweiten Komparator (18) speichert; und
    einem Lese-Entscheidungs-Schaltkreis (20), welcher den Inhalt des Speichers liest und die Taktvorrichtung so korrigiert, daß die Winkeldifferenz auf 0 reduziert wird.
  4. Schußfadeneintragskontrollvorrichtung nach Anspruch 3, bei der ein Hilfsvorwahlzähler (22) vorgesehen ist, um das Ausgangssignal des zweiten Komparators (13) ungültig zu machen, wenn der Detektor (16) ein Erfassungssignal mit einer Anzahl von Pulsen zur Verfügung stellt, die größer als eine vorbestimmte Anzahl von Windungen des Schußfadens (7) ist, die für einen Zyklus einer Eintragoperation notwendig sind.
  5. Schußfadeneintragskontrollvorrichtung nach Anspruch 3 oder 4, bei der der korrigierte Schußfaden-Rückhaltewinkel (ϑ₂) in einem vorbestimmten Kontrollbereich von Winkelwerten ist, bei der der Kontrollbereich erste und zweite Abschnitte an gegenüberliegenden Enden hat, die zusammen als Alarmbereich dienen, und bei der der erste Komparator (18) ein Rückmeldesignal an eine Eintrageschwindigkeitskontrollvorrichtung (14) gibt, wenn der korrigierte Schußfaden-Rückhaltewinkel (ϑ₂) innerhalb des Alarmbereiches des Kontrollbereichs ist.
EP86104648A 1985-04-05 1986-04-04 Verfahren und Vorrichtung für die Schussfadeneintragkontrolle Expired - Lifetime EP0196676B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60071157A JPH0733614B2 (ja) 1985-04-05 1985-04-05 よこ入れ制御方法およびその装置
JP71157/85 1985-04-05

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EP0196676A2 EP0196676A2 (de) 1986-10-08
EP0196676A3 EP0196676A3 (en) 1988-11-17
EP0196676B1 true EP0196676B1 (de) 1992-01-22

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US (1) US4702285A (de)
EP (1) EP0196676B1 (de)
JP (1) JPH0733614B2 (de)
KR (1) KR890000561B1 (de)
DE (1) DE3683516D1 (de)

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US8220500B2 (en) * 2010-08-19 2012-07-17 Shun-Hsing Wang Power loom that can adjust the speed of the wefts automatically
JP2015078454A (ja) * 2013-10-15 2015-04-23 村田機械株式会社 繊維機械の設定比較装置、設定比較方法及び表示装置、並びに、自動糸巻取機及び紡績機
CN105839276B (zh) * 2016-05-05 2018-02-09 苏州汇川技术有限公司 多喷储纬器储纱控制系统及方法
CN105937084B (zh) * 2016-06-23 2017-12-08 苏州汇川技术有限公司 储纬器退纱控制系统及方法
CN108914336B (zh) * 2018-08-09 2024-07-16 宁波乐邦电气有限公司 一种储纬器主轴同步控制系统

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CH647999A5 (de) * 1980-06-17 1985-02-28 Rueti Ag Maschf Fadenliefervorrichtung fuer textilmaschinen und verfahren zum betrieb der fadenliefervorrichtung.
SE8207098D0 (sv) * 1982-12-10 1982-12-10 Iro Ab Anordning for temporer upplagring och matning av uppmetta garnlengder, foretredesvis till dysvevmaskiner
US4550876A (en) * 1982-11-12 1985-11-05 Marvin Glass & Associates Sprinkler toy
JPS59125946A (ja) * 1982-12-27 1984-07-20 津田駒工業株式会社 流体噴射式織機用多色自由交換型緯糸貯留装置
JPS59125944A (ja) * 1982-12-27 1984-07-20 日産自動車株式会社 断片織機の緯糸供給装置
FR2548693B1 (fr) * 1983-07-07 1985-10-18 Saurer Diederichs Sa Dispositif d'entrainement en rotation pour predelivreur-mesureur de trame, sur une machine a tisser sans navette

Also Published As

Publication number Publication date
EP0196676A3 (en) 1988-11-17
EP0196676A2 (de) 1986-10-08
US4702285A (en) 1987-10-27
JPS61231241A (ja) 1986-10-15
KR860008312A (ko) 1986-11-14
KR890000561B1 (ko) 1989-03-21
JPH0733614B2 (ja) 1995-04-12
DE3683516D1 (de) 1992-03-05

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